應用缺陷式接地面結構之寬頻共模濾波器之設計

A Novel Broadband Common-mode Filter Using Defected Ground Structure

劉威宗(Wei-Tsung Liu)

指導教授 ： 吳宗霖

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2007年)

https://doi.org/10.6342/NTU.2007.00801

摘要

本論文提出一種新型的共模濾波器，此共模濾波器是利用週期性缺陷式接地面 (Defected Ground Structure) 結構所組成。這種共模濾波器為設計在印刷電路版中，而非與傳統共模扼流圈（Common-mode choke）相同為外接於電路架構之外，且此共模濾波器具有高頻及寬頻的效果。
本文將針對缺陷式接地面結構的各物理尺寸參數與特性變化作析，進而分析其週期性結構特性，並建立出等效電路模型與實驗結果比較。此外，在時域分析中，此共模濾波器對共模電壓的抑制效果達到了60％以上。而在電磁干擾的量測中，此共模濾波器在所設計的截止頻帶上可抑制共模訊號達到10dB 以上。

關鍵字

共模濾波器 ； 電磁干擾 ； 訊號完整度 ； 缺陷式接地面

並列摘要

A novel common mode filter using periodic defected ground structure (PDGS) is proposed in this thesis. Unlike raditional common mode choke using ferrite material, this kind of common mode filter with high frequency and broadband common-mode noise suppression capability is embedded in inside printed circuit board without increasing any cost.
We focus on the study of the physical size parameters and characteristic behavior of the defected ground structure. The equivalent circuit model which is also proposed and presents good agreement whit the measurement result. In time domain analys is and measurement of the PDGS, the common mode noise due to the differential signal skew can be suppressed more than 60% for the propose filter. In EMI measurement, it is demonstrated this common mode filter can suppress common mode signal more than 10 dB within the stopband.

並列關鍵字

Common-mode Filter ； electromagnetic interference ； Signal Integrity ； Defected Ground Structure

參考文獻

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[4] T. Sato, S. Ikeda, Y. Hara, K. Yamasawa, and T.Sakuma, “A new multilayered common-mode filter on Ni-Zn ferrite substrate,” IEEE trans Magnetics, vol. 37, no. 4. pp. 2900-2902, July 2001

[5] T. Sato, T. Kokai, A. Moroishi, K. Yamasawa, H. karasawa, and T.Sakuma, “Mn-Zn ferrite particle/polyimide composite think film and its application to a coupled transmission line common-mode filter,” in Proc. IEEE Int. Magnetics Conf., 2002, pp. BU4